How To Fix Doorbell Doesn't Work Tutorial Troubleshooting A To Z DIY Doorbells Malfunctions

Doorbells are often taken for granted, because these durable units can last 10 years, 15 years, or more without ever experiencing a glitch. But an outdoor location means that these electrical devices are exposed to all of the elements: broiling sunlight, rain, snow, sleet, and wind, to name a few. Any one or combination of these natural forces can cause a functional decline or outright failure. Before you call in a contractor and replace your entire doorbell system—a pricey proposition—take a few minutes to troubleshoot some of the most common problems.

Potential Problem #1: The Button

Sometimes, a physical blockage—like a clog from airborne dirt or spider nests—can prevent the doorbell button from operating. Press the button vigorously to see if it moves; if it’s stuck, clean well with a clean cloth soaked in rubbing alcohol or spray with some WD-40 to remove any debris. Should your button move freely, go a step further to try to confirm or rule out this potential source of the problem. Press the button again, this time listening for a low buzz. No buzz is no good; 

Potential Problem #2: The Chime Box

If the pressing of the button isn’t the root of the problem, the malfunction might come from within the unit the unit that produces the sound or melody: the chime box inside the house. To determine if the box is damaged, first remove it from its mounting bracket on the wall. Take off the decorative cover, locate the two wires going to the unit, and attach the leads of a volt meter to each wire. Then have a handy assistant press the doorbell button: If the volt meter registers a signal, it means that the chime box is receiving electricity but is not working by sounding off. If no signal registers on the volt meter, it means there is a problem with the wiring to the box or the transformer


Potential Problem #3: The Transformer

For most of these cases, you can troubleshoot a doorbell without shutting off the main power, because doorbells operate on very low voltage. The one exception is when you need to test the transformer, which is generally located in or near the chime box. Cut the power before you begin, then conduct a visual inspection to look for any loose connections or wires that are completely disconnected. The wires may be marked “F” for front, “R” for rear, and “T” for transformer. If no wires are loose, you should check the transformer using a volt meter: Connect the leads of the volt meter to the two terminals on the transformer. A properly functioning transformer will show a meter reading that matches the secondary voltage as marked on it. If the meter reading is higher, it indicates that the transformer is faulty and needs replacement. 

Potential Problem #4: Faulty Wiring

Sometimes the wiring between the doorbell button and the chime box may be the problem. It may have been exposed to water; damaged by rodents; or simply become bent, twisted, or frayed. Start by checking the two wires connected to the button—if they are frayed or loose, splice in a new section of wire and reattach to the button. Do the same with the wires that are attached to the chime box. If the problem is damaged insulation on the wires, you can repair them with a little electrical tape.


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